Decoders & Demultiplexers

The difference between decoders and demultiplexers is that demultiplexers select an output line. A decoder takes in inputs and uses those inputs to determine which of the 2N outputs lines is high.

digital circuit that converts an input binary code into a single numeric output
binary code input
only one output activated at a time
A decoder has:
N inputs
2N outputs
A decoder selects one of 2N outputs by decoding the binary value on the N inputs. The decoder generates all of the minterms of the N input variables. Exactly one output will be active for each combination of the inputs.
Demultiplexer (demux):
receives the output signals from the multiplexer and the receiver end it converts them back to the original form

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Description Price Logic Family Logic Function Demultiplexing Capability Number of Elements per Chip Number of Input Enables per Element Output Type Polarity Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage
RS Stock No. 809-5835
Mfr. Part No.SN74HCT138PW
Each (In a Pack of 15)
HCT Decoder, Demultiplexer 1-of-8 1 1 TTL Non-Inverting Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 5.5 V
RS Stock No. 145-6140
Mfr. Part No.SN74LS247D
Each (In a Tube of 40)
LS Decoder, Driver - 1 - Open Collector Inverting Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V
RS Stock No. 379-2011
Mfr. Part No.HCS512-I/P
Each (In a Pack of 5)
CMOS, TTL - - - - - - Through Hole PDIP 18 22.86 x 6.35 x 3.3mm 3.3mm 22.86mm -
RS Stock No. 307-575
Mfr. Part No.SN74LS42N
LS Decoder, Demultiplexer 1-of-10 1 - - Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V
RS Stock No. 662-8761
Mfr. Part No.SN74LVC1G19DCKR
Each (In a Pack of 10)
LVC Decoder, Demultiplexer 1-of-2 1 1 - Non-Inverting Surface Mount SC-70 6 2 x 1.25 x 0.9mm 0.9mm 2mm 5.5 V
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